تاثیر چند جدایه Bacillus و گوگرد بر نماتد مولد غده گوجه ‏فرنگی در شرایط گلخانه

The root-knot nematode (Meloidogyne sp.) is the most important plant parasitic nematode and more than 5% of the damage to various plants is caused by this nematode. The symptoms in the aerial parts of the plant includes stunting, yellowing and wilting, and knots in the root, which reduce the yield and quality of the product. Sulfur is an element that is produced in the soil by sulfur-oxidizing bacteria called Thiobacillus sp. Acidification of the soil causes the solubility of nutrients, and as a result, it causes better plant growth and its resistance against disease-causing agents. In this study, the effect of sulfur (15 liters in each ha) with three isolates of Bacillus (1 ml of cfu=108) on the control of root-knot nematode on tomato plants. Experiment were conducted in the form of a completely randomized basic design with eight treatments under greenhouse conditions (25±2 °C). The treatments were including Bacillus (isolate 690) + sulfur, Bacillus (isolate 469) + sulfur, Bacillus (isolate 945) + sulfur, each of the Bacillus isolates without sulfur, sulfur and infected plant as control treatment with five replicates using Duncan's test (05%). The results showed that the treatment of Bacillus (isolate 690) with sulfur had a higher effect on the control of nematode than other treatments. The results showed that fresh weight, dry weight, length of aerial parts and length of roots in the treatment of the use of 690 bacterial isolate with sulfur compared to the control resulted in an increase of 39.01%, 26.53%, 46.75% and 521% respectively. 52.52%, as well as the reduction of nematode indicators, including the number of second-stage larvae per hundred grams of rhizosphere soil, the number of eggs and egg sacs per gram of root, respectively, included 93.61%, 52.2%, and 48.27%, and in most The cases showed a significant difference.